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\section{Abstract}  \section{Introduction}  The added value of stable isotopes to interpret atmospheric hydrology has been of recent interest following the introduction remote sensing products, in-situ measurements and increasingly sophisticated models. In-situ measurements provide point measurements with good temporal coverage and resolution, but due to small scale of some of the processes influencing stable isotopes, it can be difficult to evaluate regional and global climate models. Satellite based remote sensing products have the potential to provide datasets that have appropriate spatial scales but with poor spatial resolution, and although recent attempts to asses the accuracy of these techniques these are only a couple use well calibrated in-situ measurements. Herman recently used aircraft based in-situ measurements of water isotopes to evaluate the accuracy of TES measurements and found a large positive bias in the boundary layer (herman, AMT, 2014) similar to that observed for the TCCON measurements. Likewise Schneider found a strong positive bias for columns retrieved from the IASI and NDACC datasets. These are limited to 2 locations and 3 data products, due to the effects meteorology and surface characteristics can have on retrievals, further evaluation the different products in different locations is required.  - Ground based remote sensing  - why is it useful (validation of satellites and can be more easily calibrated using in-situ measurements)  - what datasets are there (NDACC and TCCON (Wunch 2010))  - if at all how have they been calibrated.    TCCON dataset  - What is TCCON – purpose, where, spectroscopy  - TCCON has been used to validate satellite remote sensing products (Scheepmaker, Boesch), but TCCON dD has not itself been validated using independent measurement techniques.  In-Situ measurements  - how can these add value (accuracy)  - difficulties of such comparisons  Tropics  - poorly constrained hydrology  - driving force of moisture transport  - lack of measurements  - isotopically show added value not seen elsewhere (no relationship between dD and H2O – convection) – can models and remote sensing products reproduce these effects and the seasonality  - TWP is unique area strongly influenced by MJO and pacific warm pool so is an area of intense convection during the wet season.   The Darwin TCCON site and co-located Picarro instrument provides a unique opportunity to study both how tropical hydrological processing effects stable isotopes and assess the accuracy of the Darwin dD TCCON measurements. This paper analyses the added value from isotopic measurements for interpreting tropical hydrology in wet and dry seasons. We examine the roles that different dehydration processes influence the local hydrology. In addition we use in-situ measurements to assess the accuracy of dD TCCON retrievals and and determine how uncertainty influences the intepretation of seasonal cycle and atmospheric hydrological processing. Finally we examine the agreement between the modelled surface and column datasets and determine if they are sensitive to the hydrological processes observed in the in-situ surface observations.  Investigate smoothing for TCCON dD  dD from in-situ combined with Rayleigh model for a priori profile (is it better than ocean equilibrium + Rayleigh)  Do models and remote sensing observe the same hydrological processing as in-situ?  Literature  http://onlinelibrary.wiley.com/doi/10.1029/2011JD016035/full  http://onlinelibrary.wiley.com/doi/10.1029/2011JD016623/full  http://onlinelibrary.wiley.com/doi/10.1029/2011JD016621/full  http://www.atmos-meas-tech.net/7/2567/2014/amt-7-2567-2014.pdf  http://www.atmos-meas-tech.net/7/3127/2014/amt-7-3127-2014.pdf  http://www.atmos-meas-tech.net/8/483/2015/amt-8-483-2015.html  http://www.atmos-meas-tech.net/6/263/2013/amt-6-263-2013.pdf  http://www.atmos-meas-tech.net/8/1799/2015/amt-8-1799-2015.pdf  http://www.atmos-meas-tech.net/6/599/2013/amt-6-599-2013.html  \textit{Oh, an empty article!}   You can get started by \textbf{double clicking} this text block and begin editing. You can also click the \textbf{Text} button below to add new block elements. Or you can \textbf{drag and drop an image} right onto this text. Happy writing!